Reactome | HSP110s exchange ATP for ADP on HSP70s:ADP

HSP110s exchange ATP for ADP on HSP70s:ADP

Stable Identifier

R-HSA-5252079

Type

Reaction [transition]

Species

Homo sapiens

Compartment

cytosol

ReviewStatus

5/5

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HSP110s exchange ATP for ADP on HSP70s:ADP

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The substrate binding ability of heat-shock 70kDa proteins (HSP70s) is dependant on their bound state to either ATP or ADP. Release of a protein substrate is induced when HSP70s are bound to ATP and conversely, proteins substrates bind when HSP70s are bound to ADP. Intrinsic ATPase of HSP70s slowly hydrolyses ATP to ADP. This process can be speeded up by cochaperones such as HSP40s which stimulate ATPase activity. Nucleotide exchange factors (NEFs) regulate the lifespan of the HSP70:ADP:substrate complex by exchanging ADP for ATP, thus inducing the release of the substrate. Eukaryote NEFs include heat-shock protein 105kDa (HSPH1 aka HSP110) (Schuermann et al. 2008) and the BAG family molecular chaperone regulator (BAG) family (BAG1-5). BAGs inhibit the chaperone activity of HSP70s by promoting substrate release (Takayama et al. 1997, Takayama et al. 1999). HSC70-interacting protein (ST13 aka HIP) is a 48kDa tetrameric protein able to bind the ATPase domain of HSP70s and thought to stabilise the ADP state of HSP70s (Hohfeld et al. 1995, Prapapanich et al. 1996).

Literature References

PubMed ID	Title	Journal	Year
9305631	BAG-1 modulates the chaperone activity of Hsp70/Hsc70 Takayama, S, Bimston, DN, Matsuzawa, S, Freeman, BC, Aime-Sempe, C, Xie, Z, Morimoto, RI, Reed, JC	EMBO J.	1997
8721986	Molecular cloning of human p48, a transient component of progesterone receptor complexes and an Hsp70-binding protein Prapapanich, V, Chen, S, Nair, SC, Rimerman, RA, Smith, DF	Mol. Endocrinol.	1996
9873016	An evolutionarily conserved family of Hsp70/Hsc70 molecular chaperone regulators Takayama, S, Xie, Z, Reed, JC	J. Biol. Chem.	1999
7585962	Hip, a novel cochaperone involved in the eukaryotic Hsc70/Hsp40 reaction cycle Höhfeld, J, Minami, Y, Hartl, FU	Cell	1995
18550409	Structure of the Hsp110:Hsc70 nucleotide exchange machine Schuermann, JP, Jiang, J, Cuellar, J, Llorca, O, Wang, L, Gimenez, LE, Jin, S, Taylor, AB, Demeler, B, Morano, KA, Hart, PJ, Valpuesta, JM, Lafer, EM, Sousa, R	Mol. Cell	2008